低温对寒富苹果及其亲本叶绿素荧光特性的影响

Effects of Chilling on Chlorophyll Fluorescence Characteristics in Hanfu and Its Parents Plant

以寒富苹果及其亲本品种东光、富士为试验材料,通过人工低温处理,对其叶片的几种叶绿素荧光指标以及净光合速率进行了测定。结果表明:随着温度降低,3个品种的初始荧光Fo呈下降趋势,-4℃时急剧上升。可变荧光Fv、最大光化学量子产量(Fv/Fm)及Fv/Fo整体均呈下降趋势。-4℃时各个指标均大幅下降,光合速率Pn明显下降。-4℃低温处理时,Fv,Fv/Fm,Fv/Fo的值东光>寒富>富士,Fo则出现相反的结果,Pn值东光>寒富>富士。处理结束放于24℃下12 h后-4℃处理未恢复到处理前水平,表明-4℃低温对叶片的光合系统造成了严重破坏。

By freezing treatment, the chlorophyll fluorescence index were studied in this paper with the leaf of Hanfu apple, Dongguang apple and Fuji apple as materials. The result showed that：as the temperature debased, the Fo of the three breeds were all debased,and rised acuity at -4℃ ,the Fv, Fv/Fm and Fv/Fo were all debased,and the Fv/Fo of Toko was rised. All of the indexs were debased acuity at- 4℃, it showed that the photosynthesis system was destroyed acuity by the chilling.